scholarly journals Ovine progressive pneumonia provirus levels are unaffected by the prion 171R allele in an Idaho sheep flock

2009 ◽  
Vol 41 (1) ◽  
Author(s):  
Robert D Harrington ◽  
Lynn M Herrmann-Hoesing ◽  
Stephen N White ◽  
Katherine I O'Rourke ◽  
Donald P Knowles
Keyword(s):  
Sheep Flock ◽  
Ovine Progressive Pneumonia

Epidemiology and economics of clinical listeriosis in a sheep flock

1995 ◽  
Vol 24 (3) ◽  
pp. 147-156 ◽  
Author(s):  
Marilyn L. Nash ◽  
Laura L. Hungerford ◽  
Thomas G. Nash ◽  
Gene M. Zinn
Keyword(s):  
Sheep Flock

Ultrastructure and Frequency of Mastitis Caused by Ovine Progressive Pneumonia Virus Infection in Sheep

1986 ◽  
Vol 23 (2) ◽  
pp. 184-189 ◽  
Author(s):  
P. Deng ◽  
R. C. Cutlip ◽  
H. D. Lehmkuhl ◽  
K. A. Brogden
Keyword(s):  
Virus Infection ◽  
Mammary Glands ◽  
Infected Sheep ◽  
Mammary Tissue ◽  
Target Organs ◽  
Cellular Debris ◽  
Ovine Progressive Pneumonia

Twenty-five sheep, experimentally ( n = 15) or naturally ( n = 6) infected with ovine progressive pneumonia virus and noninfected controls ( n = 4), were evaluated for histological and ultrastructural lesions of mastitis. Histologically, nine of 15 experimentally infected sheep and all six naturally infected sheep had lympho-plasmacytic mastitis. Severity of the lesion increased with length of time after infection. Periductal lymphatic nodules were seen in five sheep experimentally infected for 2.8 years or longer and in five naturally infected sheep that wore 3.7 years old or older. Ultrastructurally, responses to ovine progressive pneumonia virus were diffuse lympho-plasmacytic infiltrates in glandular interstitium, lymphocytic and occasional plasmacytic infiltrates in ductal walls and lumens, lymphoblasts surrounded by small lymphocytes in glandular interstitium, and degeneration of epithelium releasing cells and cellular debris into the lumen. Based on the prevalence of lesions, the mammary tissue was more susceptible to ovine progressive pneumonia virus than other target organs: lung, brain, and synovium. Lesions did not differ between breeds of sheep. Ovine progressive pneumonia virus was not seen in the mammary tissue but was isolated from 15 of 17 mammary glands.

Sheep flock health and production: The Mackinnon project of the University of Melbourne Veterinary School

1985 ◽  
Vol 62 (s1) ◽  
pp. 142-142
Author(s):  
I M Grant ◽  
T J Watts ◽  
M B Allworth ◽  
F H W Morley ◽  
I W Caple
Keyword(s):  
Sheep Flock ◽  
Veterinary School ◽  
The University

Triple anthelmintic resistance in Trichostrongylus spp. in a German sheep flock

2012 ◽  
Vol 106 (1) ◽  
pp. 30-32 ◽  
Author(s):  
K. Voigt ◽  
M. Scheuerle ◽  
D. Hamel
Keyword(s):  
Anthelmintic Resistance ◽  
Sheep Flock

Selection and response within the nucleus of a sheep group-breeding scheme

1990 ◽  
Vol 51 (3) ◽  
pp. 593-599 ◽  
Author(s):  
S. Anderson ◽  
M. K. Curran
Keyword(s):  
Litter Size ◽  
Age Groups ◽  
Selection Response ◽  
Sheep Flock ◽  
Breeding Scheme ◽  
Average Value ◽  
Group Breeding ◽  
Selection For ◽  
Progeny Group ◽  
Selection Differentials

ABSTRACTAn evaluation of the response to selection for prolificacy within a nucleus sheep flock of a commercial group-breeding scheme is presented. In 1979, the Romney Group Breeders formed a nucleus flock of 120 prolific ewes chosen from 12 contributing flocks. A control flock was established in 1982 from the same source. The analysis was conducted on the trait of litter size. Selection differentials are presented for each year of birth progeny group in both flocks. Expected selection response was calculated from selection differentials and was found to have an average value of 1·5% of parent mean litter size per year. Using least squares procedures the litter size performance of control and nucleus ewes of 2, 3 and 4 years of age was corrected for environmental effects. Realized response was estimated from the differences between corrected litter size means of control and nucleus flocks. Response in litter size was found to be significant within years and within ewe age groups (P < 0·05).

The effect of an oral drench trace-element supplementation programme on lamb production in a commercial sheep flock in England

2007 ◽  
Vol 2007 ◽  
pp. 142-142
Author(s):  
E. Padfield ◽  
J. Alliston ◽  
GM Jones
Keyword(s):  
Bacterial Infections ◽  
Production Cycle ◽  
Growth Stages ◽  
Micronutrient Supplementation ◽  
Micronutrient Deficiencies ◽  
Sheep Flock ◽  
Micronutrient Status ◽  
Sheep Production ◽  
The Uk ◽  
Labour Time

In the UK lamb mortality is a major factor limiting profitability of sheep operations ranging from 15-22% from birth to weaning with the majority occurring in the first 24h of life (Teagasc 1991). Lamb survival to some extent is affected by micronutrient status of the ewe pre-lambing, which can be manipulated by dietary supplementation with subsequent effects on vitality and resistance to infections in the lamb (Rook et al. 2004) inadequate dietary supply of micronutrients to the lamb at later growth stages, will affect resistance to nematode and bacterial infections (Suttle and Jones 1989) and hence efficiency of growth to slaughter weight – the second major factor for profitability. The practicalities of management, labour time and concerns of cost-effectiveness, often result in no micronutrient supplementation of the sheep or the use of a drench at critical times in the sheep production cycle as a quick-fix to potential micronutrient deficiencies in sheep. This study was carried out to evaluate a micronutrient drench supplementation programme as a means of improving productivity and profitability of lamb production under commercial conditions.

scholarly journals Increasing vet and sheep flock interactions in dairy practice

In Practice ◽  
2019 ◽  
Vol 41 (4) ◽  
pp. 177-181 ◽  
Author(s):  
Emily Gascoigne ◽  
Fiona Lovatt ◽  
Andrew Davies ◽  
Jonathan Reader
Keyword(s):  
Sheep Flock

Effects of crossbred ewe genotype and ram genotype on lamb meat quality from the lowland sheep flock

2002 ◽  
Vol 2002 ◽  
pp. 52-52
Author(s):  
L.E.R. Dawson ◽  
A.F. Carson ◽  
B.W. Moss
Keyword(s):  
Recent Work ◽  
Meat Quality ◽  
Growth Index ◽  
Carcass Quality ◽  
Sheep Flock ◽  
Lean Growth ◽  
Lamb Meat

Ewe and ram genotype have been shown to have a significant effect on carcass quality. For example, Dawson and Carson (2001) demonstrated that lambs from Bluefaced Leicester X Blackface ewes were of poorer conformation than lambs from the Texel X Blackface, Suffolk X Cheviot or Texel Cheviot ewes while high lean growth index sired lambs had an improved conformation compared with lambs sired by non-recorded rams. Recent work has shown that genotype can have significant effects on the meat quality of lambs from hill sheep systems (Carson et al. 2001). Therefore the aim of the current study was to investigate the effect of ewe and ram genotype from the lowland sector on meat quality.

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